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A general observatory control software framework design for existing small and mid-size telescopes

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Research in Astronomy and Astrophysics 2015年第7期15卷 1077-1088页

作者： liang Ge xiao-Meng Lu xiao-Jun Jiang Key Laboratory of Optical Astronomy National Astronomical Observatories Chinese Academy of Sciences University of Chinese Academy of Sciences

A general framework for observatory control software would help to improve the efficiency of observation and operation of telescopes, and would also be advantageous for remote and joint observations. We describe a general framework for observatory control software, which considers principles of flexibility and inheritance to meet the expectations from observers and technical personnel. This framework includes observation scheduling, device control and data storage. The design is based on a finite state machine that controls the whole process.

关键词： telescopes -- instrumentation: detectors -- control software

Lsyn-Esyn,p-δrelation in active galactic nucleus jets and implication for the physical origin of the Lp-Ep,z-Γ_0 relation of gamma-ray bursts

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Research in Astronomy and Astrophysics 2020年第9期20卷 201-209页

作者： xiao-Li Huang En-Wei liang School of Astronomy and Space Science Nanjing UniversityNanjing 210023China Guangxi Key Laboratory for Relativistic Astrophysics School of Physical Science and TechnologyGuangxi UniversityNanning 530004China

High energy photon radiations of gamma-ray bursts(GRBs)and active galactic nuclei(AGNs)are dominated by their jet *** examine whether the synchrotron radiations of jets in BL Lacs,flat spectrum radio quasars(FSRQs),and Narrow Line Seyfert 1 galaxies(NLS1s)follow the relation between the prompt gamma-ray emission and the initial Lorentz factor(Γ0)of *** is shown that the AGN sample does not agree with the Lp-Ep,z-Γ0 relation of *** addition,we obtain a tight relation of Lsyn∝Е0.45±0.15δ3.50±0.25 syn,p for FSRQs and NLS1 galaxies,where Lsyn is the luminosity at peak photon energy Esyn,p of the synchrotron *** relation is different from the Lp-Ep,z-Γ0 relation of GRB *** dependence of Lsyn toδis consistent with the expectation of the Doppler boosting effect for the FSRQs and NLS1 galaxies,but it is not for *** argue thatΓ0 may be a representative of the kinetic power of the radiating region and the tight Lp-Ep,z-Γ0 relation is shaped by the radiation physics and the jet power together.

关键词： gamma-ray burst:general quasars:general BL Lacertae objects:general galaxies:Seyfert stars:jets radiation mechanisms:non-thermal

Cube texture evolution of Ni5W alloy substrates and La-Zr-O buffer layer of YBCO-coated conductors

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Rare Metals 2022年第11期41卷 3887-3894页

作者： Pan Wang Hui Tian Hong-Li suo Cheng Ren Ya-Ru liang Lin Ma Min Liu College of Materials Science and Engineering University of TechnologyBeijing100124China

The cube texture evolution of Ni-5 at%W alloy deformed up to a very high strain was thoroughly investigated by X-ray diffraction(XRD) and electron back-scattered diffraction(EBSD) during the process of deformation,recrystallization and grain growth.A typical copper-type rolling texture,mainly consisting of components of S,copper and brass orientations,is obtained after heavy cold *** fraction of rolling texture is slightly strengthened during recovery and then strongly reduced during recry stallization *** cube texture is formed by consuming the rolling texture components during the discontinuous recry stallization *** cube grains have a size advantage with respect to the non-cube grains.A strong cube-textured Ni5 W alloy substrate with cube texture area fraction of 98.2 %(<10°) is obtained after annealing at 1050℃ for 1 *** full width half maximum(FWHM) values for the X-ray(111) φ-scan and the(002)ω-scan of this substrate are 5.84° and 4.76°,***,the area fraction of {001}(110) orientation of the epitaxially grown La_(2)Zr_(2)O_(7) buffer layer is 97.1 %(<10°),and the FWHM values of(111) φ-scan and(002)ω-scan are 5.22° and 5.00°,respectively.

关键词： Ni5W alloy Recrystallization Texture Microstructure La_(2)Zr_(2)O_(7)

New routes for the construction of strong metal-support interactions

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Science China Chemistry 2022年第11期65卷 2051-2057页

作者： Hai Wang liang Wang Feng-Shou xiao Key Lab of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological EngineeringZhejiang UniversityHangzhou310027China College of Chemistry Zhengzhou UniversityZhengzhou 450001China

Supported metal nanoparticles(NPs)on solid carriers are highly efficient catalysts in many industrial ***,the sintering and/or leaching of metal NPs occurred under harsh reaction conditions that caused the catalyst *** metal-support interactions(SMSIs)serve as an effective method to stabilize the metal NPs against sintering and leaching,which have been extensively *** addition to the classical route to construct SMSIs via high-temperature reduction treatments,new routes have emerged recently to extend the scope of catalysts with SMSIs and optimized their catalytic *** this review,we briefly summarize these routes that avoid the high-temperature reduction treatments for the construction of *** significant advantages in stabilizing metal NPs,modulating the geometric/electronic structure of metal species,and the mechanism on the SMSI formation are particularly ***,the current challenges and developing trends in the construction of SMSIs for achieving more efficient catalysts are outlooked.

关键词： strong metal-support interaction supported catalyst metal nanoparticles heterogeneous catalysis

Corrosion behavior of nickel-based 718 alloy determined by in situ electrochemical methods at different partial pressures of H2S in 25 wt% NaCl solution at 150℃

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Rare Metals 2019年第9期38卷 855-863页

作者： Yu-Bi Zhang xiao-liang Yang An Tang School of Mechanical Engineering Henan University of EngineeringZhengzhou 451191China Chongqing Materials Research Institute Co. LtdChonging 400707China

The corrosion behavior of nickel-based 718 alloy at seven partial pressures of H2 S(PH2 S)was investigated using electrochemical impedance spectroscopy(EIS)and polarization methods in 25 wt% NaCl solution at150℃ for 168 *** tested results show that anodic reactions are controlled alternately by the diffusion mostly,then both charge transfer and diffusion and finally charge transfer mainly with the increment of PH2 *** corrosive products are composed of sulfides and oxides of Ni,Cr and Fe with double layers for PH2 S of 5.1 and 13.0 MPa and three layers for PH2 S of 10.4 MPa according to microstructures and compositions of corrosion products characterized by the scanning electron microscope(SEM)and electron probe microanalysis(EPMA)*** inner oxides layer plays a critical role in anti-corrosion in a wet H2 S environment at high temperature and pressure.

关键词： Nickel-based 718 alloy Corrosion electrochemistry Polarization Passive film

Quantum Phase Transition in Two Species of Cold Bosonic Atoms

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Communications in Theoretical Physics 2007年第3期47卷 467-470页

作者： YU Zhao-Xian liang Jiu-Qing JIAO Zhi-Yong WANG Ji-suo Institute of Theoretical Physics Shanxi University Taiyuan 030006 China Beijing Information Technology Institute Beijing 100101 China Department of Applied Physics China University of Petroleum （East China） Dongying 257061 China Department of Physics Liaocheng University Liaocheng 252059 China

In this letter, the superfluid-Mott-insulator phase transition of two-species cold bosonic atoms in an optical lattices is studied. The Hamiltonian of this model is diagonalized by means of Bogliubov transformations and by the inversion symmetry of the optical lattice, the energy spectrum of this system is obtained. From She energy gap of the excitation spectrum, the quantum phase transition condition is obtained and it is determined by the competition between the interatomic repulsions and the tunnel coupling. It is found that there exists an ordinary fluid phase when taking the zero wave-vector limit.

关键词： Bose-Einstein condensate phase transition

Investigation on the Cavitation Effect of Underwater Shock near Different Boundaries

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China Ocean Engineering 2017年第4期31卷 396-407页

作者： xiao Wei WEI Hai-peng FENG liang College of Engineering Ocean University of China Qingdao 266100 China Beijing Institute of Astronautica System Engineering Beijing 100076 China

When the shock wave of underwater explosion propagates to the surfaces of different boundaries, it gets reflected. Then, a negative pressure area is formed by the superposition of the incident wave and reflected wave. Cavitation occurs when the value of the negative pressure falls below the vapor pressure of water. An improved numerical model based on the spectral element method is applied to investigate the cavitation effect of underwater shock near different boundaries, mainly including the feature of cavitation effect near different boundaries and the influence of different parameters on cavitation effect. In the implementation of the improved numerical model, the bilinear equation of state is used to deal with the fluid field subjected to cavitation, and the field separation technique is employed to avoid the distortion of incident wave propagating through the mesh and the second-order doubly asymptotic approximation is applied to simulate the non-reflecting boundary. The main results are as follows. As the peak pressure and decay constant of shock wave increases, the range of cavitation domain increases, and the duration of cavitation increases. As the depth of water increases, the influence of cavitation on the dynamic response of spherical shell decreases.

关键词： underwater explosion cavitation fluid structure interaction spectral element boundary

Photon Counting Optical Time Domain Reflectometry Applying a Single Photon Modulation Technique

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Chinese Physics Letters 2011年第7期28卷 20-22页

作者： WANG xiao-Bo WANG Jing-Jing HE Bo xiao Lian-Tuan JIA suo-Tang State Key Laboratory of Quantum Optics and Quantum Optics Devices Laser Spectroscopy LaboratoryShanxi UniversityTaiyuan 030006

Photon-counting optical time domain reflectometry(v-OTDR)is typically used in a mode with spatial resolution in the centimeter *** we demonstrate a 1550 nm v-OTDR system to optimize the discriminate voltage of a single photon avalanche detector using a single photon modulation and demodulation technique,which shows obvious improvement in the signal *** intensity of signal is doubled when the discriminator voltage is optimized from 184 mV to 162 mV.

关键词： typically doubled system

Hierarchically 1D CdS decorated on 2D perovskite-type La_(2)Ti_(2)O_(7) nanosheet hybrids with enhanced photocatalytic performance

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Rare Metals 2021年第5期40卷 1067-1076页

作者： liang Mao xiao-Yan Cai Ming-Shan Zhu School of Materials Science and Physics China University of Mining and TechnologyXuzhou 221116China Jiangsu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipment China University of Mining and TechnologyXuzhou 221116China School of Environment Jinan UniversityGuangzhou 511443China

In this paper,a heterojunction of hierarchically one-dimensional(1D)cadmium sulfide(CdS)nanowires decorated on the two-dimensional(2D) La_(2)Ti_(2)O_(7) (LTO)has been fabricated by a simple two-step hydrothermal *** structure,morphology and surface chemical composition of CdS/LTO were studied by a variety of characterizations,in which the X-ray photoelectron spectroscopy(XPS)results showed a strong interaction between CdS and LTO through S-O *** typeⅡband alignment of CdS/LTO for favorable electron transfer from CdS to LTO and hole transfer from LTO to CdS was clarified by ultraviolet-visible(UV-Vis)diffuse reflectance spectroscopy and Mott-Schottky(M-S)plot *** the absence of any co-catalyst,H2 production from water splitting and Rhodamine B(RhB)decomposition in aqueous solution were carried out to evaluate the photocatalytic activities,showing that the photocatalytic performance of CdS/LTO was superior to that of pure LTO and CdS under visible light and simulated *** optimal CdS content in the CdS/LTO system was determined to be 7.5 wt%.The present results show an effective pathway to design a 1D/2D heterojunction photocatalyst in the face of overwhelming problems of energy crisis and environmental pollution.

关键词： Cadmium sulfide Lanthanum titanium oxide Heterojunction H_(2)production Dyes degradation